The biggest thing you'll notice is how well the car gets the power down with the 4 gear box, the car doesn't squirm on the low grip sections. I always found with the 3 gear that the car could almost tie itself in knots when it broke traction.
Weirdly the 4 gear car also seems to have more steering, I can't explain why, but everyone seems to think the same.
It'll be be the best £30 you ever spend on your X-6
